More free conversions, where you upload. The Fylane extension does the same work inside any upload form, on its own free share every day.Add to Chrome
How to protect PDF
- Drop the PDF.
- Type the password to open it.
- Press Protect and download.
What happens to your file
The file is encrypted with AES-256 — the only cipher this tool writes. Older RC4 encryption, which some tools still offer, is not offered because it can be stripped in seconds.
Contents are unchanged; anyone with the password sees exactly the document you had.
Questions
Will it open in every reader?
AES-256 has been supported by Acrobat since version 9, by Preview, Chrome, Firefox and Edge. Readers from before 2008 may not open it.
Is the password stored?
No. It is used to encrypt this one file and discarded with the job.
Do it once, not on every form
Fixing a file here means downloading it and going back to the form. The Fylane extension does this work inside the form instead, on the file you already have.
And it keeps the result. The next application that asks for a résumé, a cover letter and a photo fills all three from one tap, each one refitted to what that site accepts.
Your files stay in the browser, encrypted, on your machine. Nothing is uploaded to keep them and nothing is sent anywhere to fill a form.
Related tools
Do this in code
curl -X POST https://api.fylane.dev/v1/jobs \
-H "Authorization: Bearer $FYLANE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"file_id": "<file id>",
"operation": "pdf.encrypt",
"options": {
"password": "<password>",
"owner_password": "<password>",
"permissions": "all"
}
}'The same operation, pdf.encrypt — AES-256 password protection; the only strength offered. Upload first with the quickstart; every option is on the operations page. 500 free credits a month, then $5 per thousand.